Since I found Flank steak and Skirt steak, I no longer use ground meat for Tacos. Marinate in beer, lime juice, Cilantro, and green onions. Grill medium rare and slice thin.
I'm looking for what spices to use, not the meat. I can google "taco seasoning" and find a ton but I thought some of you might have a "special" mixture to add a different taste.